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| Treaty of Copenhagen (1660) | |
|---|---|
| Name | Treaty of Copenhagen (1660) |
| Date signed | 27 May 1660 |
| Location signed | Copenhagen |
| Parties | Kingdom of Denmark-Norway; Kingdom of Sweden |
| Language | Latin |
| Context | Second Northern War, Northern Wars |
Treaty of Copenhagen (1660)
The Treaty of Copenhagen (1660) concluded hostilities between the Kingdom of Denmark-Norway and the Kingdom of Sweden after the campaigns of the Second Northern War, the Dano-Swedish War (1657–1658), and the Northern Wars that involved the Polish–Lithuanian Commonwealth, the Tsardom of Russia, the Electorate of Brandenburg, and the Dutch Republic. Negotiated amid the aftermath of the Treaty of Roskilde (1658), the settlement adjusted borders, confirmed earlier accords such as the Treaty of Oliva (1660), and responded to pressures from the English Commonwealth, the French Kingdom, and the Holy Roman Empire. The agreement shaped the balance in the Baltic Sea and affected principalities including Schleswig, Holstein, Skåne, and Bornholm.
The treaty emerged from the collapse of the Danish invasion of Scania (1657–1658), the Siege of Copenhagen (1658–1660), and the strategic fallout of the Treaty of Roskilde (1658), which had forced the King Christian IV successor Frederick III of Denmark to cede Trondheim, Bornholm, Skåne, Blekinge, and Halland to Charles X Gustav of Sweden. Danish resistance, bolstered by the Dutch Republic fleet intervention at the Sound (Øresund), and the involvement of the Elector Frederick William of Brandenburg and the Tsar Alexei I of Russia in the anti-Swedish coalition, created a complex multiparty context. The death of Charles X Gustav in 1660 and the political shifts in the Riksdag of the Estates of Sweden, alongside the restoration of Charles II of England, opened diplomatic opportunities for revision.
Negotiations convened in Copenhagen under mediators including representatives from the Dutch Republic, the Kingdom of England, and the Holy Roman Empire. Ambassadors such as Johan de Witt proxies and envoys for Frederick III of Denmark and the Swedish regency led by Hats and Caps-era statesmen negotiated alongside ministers from Brandenburg-Prussia and the Polish–Lithuanian Commonwealth. Talks referenced prior accords like the Treaty of Brömsebro (1645) and the Treaty of Lübeck (1629). Signing took place on 27 May 1660 with sealers representing the crowns of Denmark-Norway and Sweden, witnessed by delegates from Amsterdam, London, Paris, and imperial agents from Vienna.
The treaty reaffirmed certain provisions of the Treaty of Roskilde (1658) while annulling or adjusting others: Denmark recovered Bornholm and Trondheim-adjacent rights previously ceded to Sweden, and Sweden retained Skåne, Blekinge, and Halland under crown possession but accepted limitations on fortifications and harbor works affecting the Baltic Sea trade routes. Provisions addressed navigation and tolls in the Øresund, clarifying the role of the Sound Dues and rights of merchant states including the Dutch Republic and English Republic/Kingdom of England. Clauses regulated prisoner exchanges from the Siege of Copenhagen and set indemnities and reparations to be paid by Sweden to private claimants and municipal corporations in Copenhagen and Aarhus. The pact incorporated mutual non-aggression stipulations and agreements on extradition for rebels from Schleswig and Holstein nobility.
Territorially, the accord reversed Swedish possession of Bornholm and readjusted influence in Bohuslän and the Scanian Provinces though Sweden retained most gains from Roskilde. Politically, the treaty strengthened Frederick III’s position, enabling the consolidation of the Danish absolute monarchy after the Revolution of 1660 and the introduction of the Kongeloven (Lex Regia). For Sweden, the settlement influenced internal politics during the minority and regency of Charles XI of Sweden and shifted Magnate and Riksråd prerogatives. The settlement impacted the ambitions of Frederick William, Elector of Brandenburg regarding Prussia and Stettin (Szczecin), and influenced subsequent Treaty of Oliva (1660) implementations regarding the Polish–Lithuanian Commonwealth and the Holy Roman Empire.
Implementation relied on naval power projection from the Royal Danish Navy and the Swedish Navy, diplomatic pressure from the Dutch navy squadrons, and guaranties from powers including France and the Holy Roman Emperor Leopold I. Enforcement mechanisms involved demilitarization clauses for key fortresses such as Kronborg and Carlsten and the appointment of joint commissions to demarcate boundary markers in Skåne and Bornholm; these commissions included surveyors and legal advisors from Copenhagen University-affiliated scholars and Swedish crown officials. Local compliance varied: municipal councils in Malmö, Helsingborg, Ribe, and Aalborg contested property restitutions, while noble estates in Jutland and Sjaelland negotiated compensation under royal oversight. Periodic diplomatic protests were lodged in Stockholm and Copenhagen courts when implementation disputes arose.
European capitals reacted: Amsterdam and London welcomed resolved Baltic commerce issues, Paris and Versailles viewed the treaty as part of Louis XIV’s balancing of northern affairs, and the Habsburg Monarchy considered implications for imperial Baltic influence. The treaty shaped later diplomatic practice in the Baltic region, influenced the development of the Balance of Power concept among states like England, France, Brandenburg-Prussia, and the Dutch Republic, and informed later conflicts including the Great Northern War (1700–1721). Historians link the accord to institutional changes such as the rise of Danish absolutism under Kongeloven and Swedish state centralization preceding Charles XI’s reduction policies. The Treaty of Copenhagen thus stands as a pivotal document in seventeenth-century Northern European statecraft and maritime regulation.
Category:1660 treaties Category:History of Denmark Category:History of Sweden